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Wen-Cheng Lai,Sheng-Lyang Jang,Yi-You Liu,Miin-Horng Juang 대한전자공학회 2016 Journal of semiconductor technology and science Vol.16 No.4
A triple-band (TB) oscillator was implemented in the TSMC 0.18 ㎛ 1P6M CMOS process, and it uses a cross-coupled nMOS pair and two shunt 4<SUP>th</SUP> order LC resonators to form a 6<SUP>th</SUP> order resonator with three resonant frequencies. The oscillator uses the varactors for band switching and frequency tuning. The core current and power consumption of the high (middle, low)- band core oscillator are 3.59(3.42, 3.4) ㎃ and 2.4(2.29, 2.28) ㎽, respectively at the dc drain-source bias of 0.67V. The oscillator can generate differential signals in the frequency range of 8.04-8.68 ㎓, 5.82-6.15 ㎓, and 3.68-4.08 ㎓. The die area of the triple-band oscillator is 0.835 × 1.103 ㎟.
고에너지 고밀도 고리탄화수소 화합물의 구조에 따른 물성 연구
조준현(Joonhyun Cho),권태수(Taesoo Kwon),정덕진(Deokjin Jeong),오창호(Changho Oh),박대인(Daein Park),한정식(Jeongsik Han) 한국추진공학회 2008 한국추진공학회 학술대회논문집 Vol.2008 No.11
액체 추진기관을 적용하는 무기체계는 용도가 점차 증가되는 추세에 있으며, 운용목적 및 환경에 따라 다양한 물성을 가진 액체연료의 수요도 많아지고 있다. norbornane 또는 dicyclopentane 구조를 포함한 고리탄화수소 화합물은 고밀도 고에너지 특성을 바탕으로 다양한 유도무기체계에 적용되고 있으며, 현재도 많은 분야에서 연구 대상이 되고 있다. 본 연구에서는 분자물질의 설계 및 이를 대상으로 합성한 다양한 고리형 탄화수소화합물의 물성을 분석하여 그 구조에 따라 밀도와 발열량등 이화학 특성이 어떤 경향을 나타내는지 알아보았다. The weapon systems with a liquid propulsion engine have been used for various purposes and demands of the liquid fuel with variety of properties for its operational purposes and environment. The cyclic hydrocarbons including norbornane or dicyclopentane structures have many applications to the guided weapon systems due to the high density and high energy characteristics, also efforts have been given in many fields. In this study, the cyclic hydrocarbons that we designed and fabricated were investigated to obtain tendency on the structures.
신미연,권대규,유창호 제어로봇시스템학회 2019 제어로봇시스템학회 각 지부별 자료집 Vol.2019 No.1
In this paper, Zr0.9Ti0.1Cr0.6Fe1.4 and Zr0.9Ti0.1Cr0.7Fe1.3 were selected as Metal-Hydride(MH) alloys for driving the rehabilitative system. The MH alloys were fabricated by Arc-melting and the compositions of its were analyzed by Field Emission Scaning Electron Microscope(FE-SEM), Energy Dispersive X-ray Spectroscopy(EDS), X-Ray Diffractometry(XRD) and Inductively Coupled Plasma(ICP). As a result of the analysis, the alloys were nonuniform in composition although it was prepared as a single phase of hexagonal structure. In the future, the hydrogen storage capacity of the MH alloys will be evaluated by producing P-C-T diagram of each MH alloys. And MH alloys will be used at driving actuation system for confirming its actual performance.
Tunable Properties of Ferroelectric Thick Films With MgO Added on (BaSr)TiO₃
In-Sung Kim,Jae-Sung Song,Soon-Jong Jeong,So-Hyun Jeon,Jun-Ki Chung,Won-Jeong Kim 대한전기학회 2007 Journal of Electrical Engineering & Technology Vol.2 No.3
MgO enhanced (Ba0.6Sr0.4) TiO₃ thick films have been fabricated by a tape casting and firing method for tunable devices on the microwave frequency band. In order to improve ferroelectric properties, the composite thick films enhanced with MgO on BST have been asymmetrically annealed by a focused halogen beam method. Dielectric constants of composite thick films are changed from 1050 to 1300 at 100 ㎑ after 60 sand 150 s annealing by the focused halogen beam. Even though no prominent changes were previously observed from the thick films before and after annealing in terms of chemical composition and surface morphology, it is clear that the average particle size of the thick films calculated by Scherrer's formula were increased by annealing. Furthermore, a strong correlation between particle size and dielectric constant of the composite thick films has been observed; dielectric constant increases with increased particle size. This has been attributed to the increased volume of ferroelectric domain due to increased particle sizes. As a result, the tuning range was improved by halogen beam annealing.